1 /* -*- c -*- --------------------------------------------------------------- *
3 * linux/fs/autofs/root.c
5 * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
6 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
7 * Copyright 2001-2006 Ian Kent <raven@themaw.net>
9 * This file is part of the Linux kernel and is made available under
10 * the terms of the GNU General Public License, version 2, or at your
11 * option, any later version, incorporated herein by reference.
13 * ------------------------------------------------------------------------- */
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/stat.h>
18 #include <linux/slab.h>
19 #include <linux/param.h>
20 #include <linux/time.h>
21 #include <linux/compat.h>
22 #include <linux/mutex.h>
26 DEFINE_SPINLOCK(autofs4_lock);
28 static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
29 static int autofs4_dir_unlink(struct inode *,struct dentry *);
30 static int autofs4_dir_rmdir(struct inode *,struct dentry *);
31 static int autofs4_dir_mkdir(struct inode *,struct dentry *,int);
32 static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long);
34 static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long);
36 static int autofs4_dir_open(struct inode *inode, struct file *file);
37 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
38 static struct vfsmount *autofs4_d_automount(struct path *);
39 static int autofs4_d_manage(struct dentry *, bool, bool);
41 const struct file_operations autofs4_root_operations = {
42 .open = dcache_dir_open,
43 .release = dcache_dir_close,
44 .read = generic_read_dir,
45 .readdir = dcache_readdir,
46 .llseek = dcache_dir_lseek,
47 .unlocked_ioctl = autofs4_root_ioctl,
49 .compat_ioctl = autofs4_root_compat_ioctl,
53 const struct file_operations autofs4_dir_operations = {
54 .open = autofs4_dir_open,
55 .release = dcache_dir_close,
56 .read = generic_read_dir,
57 .readdir = dcache_readdir,
58 .llseek = dcache_dir_lseek,
61 const struct inode_operations autofs4_dir_inode_operations = {
62 .lookup = autofs4_lookup,
63 .unlink = autofs4_dir_unlink,
64 .symlink = autofs4_dir_symlink,
65 .mkdir = autofs4_dir_mkdir,
66 .rmdir = autofs4_dir_rmdir,
69 const struct dentry_operations autofs4_dentry_operations = {
70 .d_automount = autofs4_d_automount,
71 .d_manage = autofs4_d_manage,
72 .d_release = autofs4_dentry_release,
75 static void autofs4_add_active(struct dentry *dentry)
77 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
78 struct autofs_info *ino = autofs4_dentry_ino(dentry);
80 spin_lock(&sbi->lookup_lock);
81 if (!ino->active_count) {
82 if (list_empty(&ino->active))
83 list_add(&ino->active, &sbi->active_list);
86 spin_unlock(&sbi->lookup_lock);
91 static void autofs4_del_active(struct dentry *dentry)
93 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
94 struct autofs_info *ino = autofs4_dentry_ino(dentry);
96 spin_lock(&sbi->lookup_lock);
98 if (!ino->active_count) {
99 if (!list_empty(&ino->active))
100 list_del_init(&ino->active);
102 spin_unlock(&sbi->lookup_lock);
107 static int autofs4_dir_open(struct inode *inode, struct file *file)
109 struct dentry *dentry = file->f_path.dentry;
110 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
112 DPRINTK("file=%p dentry=%p %.*s",
113 file, dentry, dentry->d_name.len, dentry->d_name.name);
115 if (autofs4_oz_mode(sbi))
119 * An empty directory in an autofs file system is always a
120 * mount point. The daemon must have failed to mount this
121 * during lookup so it doesn't exist. This can happen, for
122 * example, if user space returns an incorrect status for a
123 * mount request. Otherwise we're doing a readdir on the
124 * autofs file system so just let the libfs routines handle
127 spin_lock(&autofs4_lock);
128 spin_lock(&dentry->d_lock);
129 if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
130 spin_unlock(&dentry->d_lock);
131 spin_unlock(&autofs4_lock);
134 spin_unlock(&dentry->d_lock);
135 spin_unlock(&autofs4_lock);
138 return dcache_dir_open(inode, file);
141 void autofs4_dentry_release(struct dentry *de)
143 struct autofs_info *inf;
145 DPRINTK("releasing %p", de);
147 inf = autofs4_dentry_ino(de);
149 struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb);
151 spin_lock(&sbi->lookup_lock);
152 if (!list_empty(&inf->active))
153 list_del(&inf->active);
154 if (!list_empty(&inf->expiring))
155 list_del(&inf->expiring);
156 spin_unlock(&sbi->lookup_lock);
158 autofs4_free_ino(inf);
162 static struct dentry *autofs4_lookup_active(struct dentry *dentry)
164 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
165 struct dentry *parent = dentry->d_parent;
166 struct qstr *name = &dentry->d_name;
167 unsigned int len = name->len;
168 unsigned int hash = name->hash;
169 const unsigned char *str = name->name;
170 struct list_head *p, *head;
172 spin_lock(&autofs4_lock);
173 spin_lock(&sbi->lookup_lock);
174 head = &sbi->active_list;
175 list_for_each(p, head) {
176 struct autofs_info *ino;
177 struct dentry *active;
180 ino = list_entry(p, struct autofs_info, active);
181 active = ino->dentry;
183 spin_lock(&active->d_lock);
186 if (active->d_count == 0)
189 qstr = &active->d_name;
191 if (active->d_name.hash != hash)
193 if (active->d_parent != parent)
196 if (qstr->len != len)
198 if (memcmp(qstr->name, str, len))
201 if (d_unhashed(active)) {
203 spin_unlock(&active->d_lock);
204 spin_unlock(&sbi->lookup_lock);
205 spin_unlock(&autofs4_lock);
209 spin_unlock(&active->d_lock);
211 spin_unlock(&sbi->lookup_lock);
212 spin_unlock(&autofs4_lock);
217 static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
219 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
220 struct dentry *parent = dentry->d_parent;
221 struct qstr *name = &dentry->d_name;
222 unsigned int len = name->len;
223 unsigned int hash = name->hash;
224 const unsigned char *str = name->name;
225 struct list_head *p, *head;
227 spin_lock(&autofs4_lock);
228 spin_lock(&sbi->lookup_lock);
229 head = &sbi->expiring_list;
230 list_for_each(p, head) {
231 struct autofs_info *ino;
232 struct dentry *expiring;
235 ino = list_entry(p, struct autofs_info, expiring);
236 expiring = ino->dentry;
238 spin_lock(&expiring->d_lock);
240 /* Bad luck, we've already been dentry_iput */
241 if (!expiring->d_inode)
244 qstr = &expiring->d_name;
246 if (expiring->d_name.hash != hash)
248 if (expiring->d_parent != parent)
251 if (qstr->len != len)
253 if (memcmp(qstr->name, str, len))
256 if (d_unhashed(expiring)) {
257 dget_dlock(expiring);
258 spin_unlock(&expiring->d_lock);
259 spin_unlock(&sbi->lookup_lock);
260 spin_unlock(&autofs4_lock);
264 spin_unlock(&expiring->d_lock);
266 spin_unlock(&sbi->lookup_lock);
267 spin_unlock(&autofs4_lock);
272 static int autofs4_mount_wait(struct dentry *dentry)
274 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
275 struct autofs_info *ino = autofs4_dentry_ino(dentry);
278 if (ino->flags & AUTOFS_INF_PENDING) {
279 DPRINTK("waiting for mount name=%.*s",
280 dentry->d_name.len, dentry->d_name.name);
281 status = autofs4_wait(sbi, dentry, NFY_MOUNT);
282 DPRINTK("mount wait done status=%d", status);
283 ino->last_used = jiffies;
289 static int do_expire_wait(struct dentry *dentry)
291 struct dentry *expiring;
293 expiring = autofs4_lookup_expiring(dentry);
295 return autofs4_expire_wait(dentry);
298 * If we are racing with expire the request might not
299 * be quite complete, but the directory has been removed
300 * so it must have been successful, just wait for it.
302 autofs4_expire_wait(expiring);
303 autofs4_del_expiring(expiring);
309 static struct dentry *autofs4_mountpoint_changed(struct path *path)
311 struct dentry *dentry = path->dentry;
312 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
315 * If this is an indirect mount the dentry could have gone away
316 * as a result of an expire and a new one created.
318 if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
319 struct dentry *parent = dentry->d_parent;
320 struct dentry *new = d_lookup(parent, &dentry->d_name);
329 static struct vfsmount *autofs4_d_automount(struct path *path)
331 struct dentry *dentry = path->dentry;
332 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
333 struct autofs_info *ino = autofs4_dentry_ino(dentry);
336 DPRINTK("dentry=%p %.*s",
337 dentry, dentry->d_name.len, dentry->d_name.name);
340 * Someone may have manually umounted this or it was a submount
341 * that has gone away.
343 spin_lock(&dentry->d_lock);
344 if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
345 if (!(dentry->d_flags & DCACHE_MANAGE_TRANSIT) &&
346 (dentry->d_flags & DCACHE_NEED_AUTOMOUNT))
347 __managed_dentry_set_transit(path->dentry);
349 spin_unlock(&dentry->d_lock);
351 /* The daemon never triggers a mount. */
352 if (autofs4_oz_mode(sbi))
356 * If an expire request is pending everyone must wait.
357 * If the expire fails we're still mounted so continue
358 * the follow and return. A return of -EAGAIN (which only
359 * happens with indirect mounts) means the expire completed
360 * and the directory was removed, so just go ahead and try
363 status = do_expire_wait(dentry);
364 if (status && status != -EAGAIN)
367 /* Callback to the daemon to perform the mount or wait */
368 spin_lock(&sbi->fs_lock);
369 if (ino->flags & AUTOFS_INF_PENDING) {
370 spin_unlock(&sbi->fs_lock);
371 status = autofs4_mount_wait(dentry);
373 return ERR_PTR(status);
374 spin_lock(&sbi->fs_lock);
379 * If the dentry is a symlink it's equivalent to a directory
380 * having d_mountpoint() true, so there's no need to call back
383 if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode))
385 if (!d_mountpoint(dentry)) {
387 * It's possible that user space hasn't removed directories
388 * after umounting a rootless multi-mount, although it
389 * should. For v5 have_submounts() is sufficient to handle
390 * this because the leaves of the directory tree under the
391 * mount never trigger mounts themselves (they have an autofs
392 * trigger mount mounted on them). But v4 pseudo direct mounts
393 * do need the leaves to to trigger mounts. In this case we
394 * have no choice but to use the list_empty() check and
395 * require user space behave.
397 if (sbi->version > 4) {
398 if (have_submounts(dentry))
401 spin_lock(&dentry->d_lock);
402 if (!list_empty(&dentry->d_subdirs)) {
403 spin_unlock(&dentry->d_lock);
406 spin_unlock(&dentry->d_lock);
408 ino->flags |= AUTOFS_INF_PENDING;
409 spin_unlock(&sbi->fs_lock);
410 status = autofs4_mount_wait(dentry);
412 return ERR_PTR(status);
413 spin_lock(&sbi->fs_lock);
414 ino->flags &= ~AUTOFS_INF_PENDING;
417 if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
419 * Any needed mounting has been completed and the path updated
420 * so turn this into a normal dentry so we don't continually
421 * call ->d_automount() and ->d_manage().
423 spin_lock(&dentry->d_lock);
424 __managed_dentry_clear_transit(dentry);
426 * Only clear DMANAGED_AUTOMOUNT for rootless multi-mounts and
427 * symlinks as in all other cases the dentry will be covered by
428 * an actual mount so ->d_automount() won't be called during
431 if ((!d_mountpoint(dentry) &&
432 !list_empty(&dentry->d_subdirs)) ||
433 (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
434 __managed_dentry_clear_automount(dentry);
435 spin_unlock(&dentry->d_lock);
437 spin_unlock(&sbi->fs_lock);
439 /* Mount succeeded, check if we ended up with a new dentry */
440 dentry = autofs4_mountpoint_changed(path);
442 return ERR_PTR(-ENOENT);
447 int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk)
449 struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
451 DPRINTK("dentry=%p %.*s",
452 dentry, dentry->d_name.len, dentry->d_name.name);
454 /* The daemon never waits. */
455 if (autofs4_oz_mode(sbi) || mounting_here) {
456 if (!d_mountpoint(dentry))
461 /* We need to sleep, so we need pathwalk to be in ref-mode */
465 /* Wait for pending expires */
466 do_expire_wait(dentry);
469 * This dentry may be under construction so wait on mount
472 return autofs4_mount_wait(dentry);
475 /* Lookups in the root directory */
476 static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
478 struct autofs_sb_info *sbi;
479 struct autofs_info *ino;
480 struct dentry *active;
482 DPRINTK("name = %.*s", dentry->d_name.len, dentry->d_name.name);
484 /* File name too long to exist */
485 if (dentry->d_name.len > NAME_MAX)
486 return ERR_PTR(-ENAMETOOLONG);
488 sbi = autofs4_sbi(dir->i_sb);
490 DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
491 current->pid, task_pgrp_nr(current), sbi->catatonic,
492 autofs4_oz_mode(sbi));
494 active = autofs4_lookup_active(dentry);
499 * A dentry that is not within the root can never trigger a
500 * mount operation, unless the directory already exists, so we
501 * can return fail immediately. The daemon however does need
502 * to create directories within the file system.
504 if (!autofs4_oz_mode(sbi) && !IS_ROOT(dentry->d_parent))
505 return ERR_PTR(-ENOENT);
507 /* Mark entries in the root as mount triggers */
508 if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
509 __managed_dentry_set_managed(dentry);
511 ino = autofs4_init_ino(NULL, sbi, 0555);
513 return ERR_PTR(-ENOMEM);
515 dentry->d_fsdata = ino;
516 ino->dentry = dentry;
518 autofs4_add_active(dentry);
520 d_instantiate(dentry, NULL);
525 static int autofs4_dir_symlink(struct inode *dir,
526 struct dentry *dentry,
529 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
530 struct autofs_info *ino = autofs4_dentry_ino(dentry);
531 struct autofs_info *p_ino;
535 DPRINTK("%s <- %.*s", symname,
536 dentry->d_name.len, dentry->d_name.name);
538 if (!autofs4_oz_mode(sbi))
541 ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555);
545 autofs4_del_active(dentry);
547 ino->size = strlen(symname);
548 cp = kmalloc(ino->size + 1, GFP_KERNEL);
550 if (!dentry->d_fsdata)
557 inode = autofs4_get_inode(dir->i_sb, ino);
560 if (!dentry->d_fsdata)
564 inode->i_private = cp;
565 d_add(dentry, inode);
567 dentry->d_fsdata = ino;
568 ino->dentry = dget(dentry);
569 atomic_inc(&ino->count);
570 p_ino = autofs4_dentry_ino(dentry->d_parent);
571 if (p_ino && dentry->d_parent != dentry)
572 atomic_inc(&p_ino->count);
574 dir->i_mtime = CURRENT_TIME;
582 * Normal filesystems would do a "d_delete()" to tell the VFS dcache
583 * that the file no longer exists. However, doing that means that the
584 * VFS layer can turn the dentry into a negative dentry. We don't want
585 * this, because the unlink is probably the result of an expire.
586 * We simply d_drop it and add it to a expiring list in the super block,
587 * which allows the dentry lookup to check for an incomplete expire.
589 * If a process is blocked on the dentry waiting for the expire to finish,
590 * it will invalidate the dentry and try to mount with a new one.
592 * Also see autofs4_dir_rmdir()..
594 static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
596 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
597 struct autofs_info *ino = autofs4_dentry_ino(dentry);
598 struct autofs_info *p_ino;
600 /* This allows root to remove symlinks */
601 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
604 if (atomic_dec_and_test(&ino->count)) {
605 p_ino = autofs4_dentry_ino(dentry->d_parent);
606 if (p_ino && dentry->d_parent != dentry)
607 atomic_dec(&p_ino->count);
611 dentry->d_inode->i_size = 0;
612 clear_nlink(dentry->d_inode);
614 dir->i_mtime = CURRENT_TIME;
616 spin_lock(&autofs4_lock);
617 autofs4_add_expiring(dentry);
618 spin_lock(&dentry->d_lock);
620 spin_unlock(&dentry->d_lock);
621 spin_unlock(&autofs4_lock);
627 * Version 4 of autofs provides a pseudo direct mount implementation
628 * that relies on directories at the leaves of a directory tree under
629 * an indirect mount to trigger mounts. To allow for this we need to
630 * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
631 * of the directory tree. There is no need to clear the automount flag
632 * following a mount or restore it after an expire because these mounts
633 * are always covered. However, it is neccessary to ensure that these
634 * flags are clear on non-empty directories to avoid unnecessary calls
637 static void autofs_set_leaf_automount_flags(struct dentry *dentry)
639 struct dentry *parent;
641 /* root and dentrys in the root are already handled */
642 if (IS_ROOT(dentry->d_parent))
645 managed_dentry_set_managed(dentry);
647 parent = dentry->d_parent;
648 /* only consider parents below dentrys in the root */
649 if (IS_ROOT(parent->d_parent))
651 managed_dentry_clear_managed(parent);
655 static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
657 struct list_head *d_child;
658 struct dentry *parent;
660 /* flags for dentrys in the root are handled elsewhere */
661 if (IS_ROOT(dentry->d_parent))
664 managed_dentry_clear_managed(dentry);
666 parent = dentry->d_parent;
667 /* only consider parents below dentrys in the root */
668 if (IS_ROOT(parent->d_parent))
670 d_child = &dentry->d_u.d_child;
671 /* Set parent managed if it's becoming empty */
672 if (d_child->next == &parent->d_subdirs &&
673 d_child->prev == &parent->d_subdirs)
674 managed_dentry_set_managed(parent);
678 static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
680 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
681 struct autofs_info *ino = autofs4_dentry_ino(dentry);
682 struct autofs_info *p_ino;
684 DPRINTK("dentry %p, removing %.*s",
685 dentry, dentry->d_name.len, dentry->d_name.name);
687 if (!autofs4_oz_mode(sbi))
690 spin_lock(&autofs4_lock);
691 spin_lock(&sbi->lookup_lock);
692 spin_lock(&dentry->d_lock);
693 if (!list_empty(&dentry->d_subdirs)) {
694 spin_unlock(&dentry->d_lock);
695 spin_unlock(&sbi->lookup_lock);
696 spin_unlock(&autofs4_lock);
699 __autofs4_add_expiring(dentry);
700 spin_unlock(&sbi->lookup_lock);
702 spin_unlock(&dentry->d_lock);
703 spin_unlock(&autofs4_lock);
705 if (sbi->version < 5)
706 autofs_clear_leaf_automount_flags(dentry);
708 if (atomic_dec_and_test(&ino->count)) {
709 p_ino = autofs4_dentry_ino(dentry->d_parent);
710 if (p_ino && dentry->d_parent != dentry)
711 atomic_dec(&p_ino->count);
714 dentry->d_inode->i_size = 0;
715 clear_nlink(dentry->d_inode);
723 static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
725 struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
726 struct autofs_info *ino = autofs4_dentry_ino(dentry);
727 struct autofs_info *p_ino;
730 if (!autofs4_oz_mode(sbi))
733 DPRINTK("dentry %p, creating %.*s",
734 dentry, dentry->d_name.len, dentry->d_name.name);
736 ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555);
740 autofs4_del_active(dentry);
742 inode = autofs4_get_inode(dir->i_sb, ino);
744 if (!dentry->d_fsdata)
748 d_add(dentry, inode);
750 if (sbi->version < 5)
751 autofs_set_leaf_automount_flags(dentry);
753 dentry->d_fsdata = ino;
754 ino->dentry = dget(dentry);
755 atomic_inc(&ino->count);
756 p_ino = autofs4_dentry_ino(dentry->d_parent);
757 if (p_ino && dentry->d_parent != dentry)
758 atomic_inc(&p_ino->count);
760 dir->i_mtime = CURRENT_TIME;
765 /* Get/set timeout ioctl() operation */
767 static inline int autofs4_compat_get_set_timeout(struct autofs_sb_info *sbi,
768 compat_ulong_t __user *p)
771 unsigned long ntimeout;
773 if ((rv = get_user(ntimeout, p)) ||
774 (rv = put_user(sbi->exp_timeout/HZ, p)))
777 if (ntimeout > UINT_MAX/HZ)
778 sbi->exp_timeout = 0;
780 sbi->exp_timeout = ntimeout * HZ;
786 static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
787 unsigned long __user *p)
790 unsigned long ntimeout;
792 if ((rv = get_user(ntimeout, p)) ||
793 (rv = put_user(sbi->exp_timeout/HZ, p)))
796 if (ntimeout > ULONG_MAX/HZ)
797 sbi->exp_timeout = 0;
799 sbi->exp_timeout = ntimeout * HZ;
804 /* Return protocol version */
805 static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
807 return put_user(sbi->version, p);
810 /* Return protocol sub version */
811 static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
813 return put_user(sbi->sub_version, p);
817 * Tells the daemon whether it can umount the autofs mount.
819 static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
826 DPRINTK("returning %d", status);
828 status = put_user(status, p);
833 /* Identify autofs4_dentries - this is so we can tell if there's
834 an extra dentry refcount or not. We only hold a refcount on the
835 dentry if its non-negative (ie, d_inode != NULL)
837 int is_autofs4_dentry(struct dentry *dentry)
839 return dentry && dentry->d_inode &&
840 dentry->d_op == &autofs4_dentry_operations &&
841 dentry->d_fsdata != NULL;
845 * ioctl()'s on the root directory is the chief method for the daemon to
846 * generate kernel reactions
848 static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
849 unsigned int cmd, unsigned long arg)
851 struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
852 void __user *p = (void __user *)arg;
854 DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
855 cmd,arg,sbi,task_pgrp_nr(current));
857 if (_IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
858 _IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT)
861 if (!autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN))
865 case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
866 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
867 case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
868 return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
869 case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
870 autofs4_catatonic_mode(sbi);
872 case AUTOFS_IOC_PROTOVER: /* Get protocol version */
873 return autofs4_get_protover(sbi, p);
874 case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
875 return autofs4_get_protosubver(sbi, p);
876 case AUTOFS_IOC_SETTIMEOUT:
877 return autofs4_get_set_timeout(sbi, p);
879 case AUTOFS_IOC_SETTIMEOUT32:
880 return autofs4_compat_get_set_timeout(sbi, p);
883 case AUTOFS_IOC_ASKUMOUNT:
884 return autofs4_ask_umount(filp->f_path.mnt, p);
886 /* return a single thing to expire */
887 case AUTOFS_IOC_EXPIRE:
888 return autofs4_expire_run(inode->i_sb,filp->f_path.mnt,sbi, p);
889 /* same as above, but can send multiple expires through pipe */
890 case AUTOFS_IOC_EXPIRE_MULTI:
891 return autofs4_expire_multi(inode->i_sb,filp->f_path.mnt,sbi, p);
898 static long autofs4_root_ioctl(struct file *filp,
899 unsigned int cmd, unsigned long arg)
901 struct inode *inode = filp->f_dentry->d_inode;
902 return autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
906 static long autofs4_root_compat_ioctl(struct file *filp,
907 unsigned int cmd, unsigned long arg)
909 struct inode *inode = filp->f_path.dentry->d_inode;
912 if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
913 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
915 ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
916 (unsigned long)compat_ptr(arg));